Growth of metamorphic and peritectic garnets in ultrahigh-pressure metagranite during continental subduction and exhumation in the Dabie orogen

Xia, Qiong‐Xia; Wang, Haozheng; Zhou, Ligang; Gao, Xiao‐Ying; Zheng, Yong‐Fei; Orman, James A. Van; Xu, H.; Hu, Zhaochu

doi:10.1016/j.lithos.2016.08.043

Cited by 30 publications

(6 citation statements)

References 145 publications

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“…The irregular and curvilinear boundaries between the cores and mantles, together with the high Mn content of the latter (Fig. 3A-F), suggests that the garnet cores were partially resorbed (Perchuk et al 2005(Perchuk et al , 2008Liu et al 2014;Xia et al 2016;Xia and Zhou 2017). Garnet has been documented to be a reactant during white mica-dehydration melting, producing kyanite and biotite as products (Indares and Dunning 2001;Lang and Gilotti 2007).…”

Section: Metamorphic Evolution Of the Avardo Gneiss At Sippmikk Creekmentioning

confidence: 99%

Zircon and monazite reveal late Cambrian/early Ordovician partial melting of the Central Seve Nappe Complex, Scandinavian Caledonides

Barnes

Bukała

Callegari

et al. 2022

Contrib Mineral Petrol

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The Seve Nappe Complex (SNC) comprises continental rocks of Baltica that were subducted and exhumed during the Caledonian orogeny prior to collision with Laurentia. The tectonic history of the central SNC is investigated by applying in-situ zircon and monazite (Th-)U–Pb geochronology and trace element analysis to (ultra-)high pressure (UHP) paragneisses in the Avardo and Marsfjället gneisses. Zircons in the Avardo Gneiss exposed at Sippmikk creek exhibit xenocrystic cores with metamorphic rims. Cores show typical igneous REE profiles and were affected by partial Pb-loss. The rims have flat HREE profiles and are interpreted to have crystallized at 482.5 ± 3.7 Ma during biotite-dehydration melting and peritectic garnet growth. Monazites in the paragneiss are chemically homogeneous and record metamorphism at 420.6 ± 2.0 Ma. In the Marsfjället Gneiss exposed near Kittelfjäll, monazites exhibit complex zoning with cores enveloped by mantles and rims. The cores are interpreted to have crystallized at 481.6 ± 2.1 Ma, possibly during garnet resorption. The mantles and rims provide a dispersion of dates and are interpreted to have formed by melt-driven dissolution-reprecipitation of pre-existing monazites until 463.1 ± 1.8 Ma. Depletion of Y, HREE, and U in the mantles and rims compared to the cores record peritectic garnet and zircon growth. Altogether, the Avardo and Marsfjället gneisses show evidence of late Cambrian/early Ordovician partial melting (possibly in (U)HP conditions), Middle Ordovician (U)HP metamorphism, and late Silurian tectonism. These results indicate that the SNC underwent south-to-north oblique subduction in late Cambrian time, followed by progressive north-to-south exhumation to crustal levels prior to late Silurian continental collision.

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Section: Metamorphic Evolution Of the Avardo Gneiss At Sippmikk Creekmentioning

confidence: 99%

Zircon and monazite reveal late Cambrian/early Ordovician partial melting of the Central Seve Nappe Complex, Scandinavian Caledonides

Barnes

Bukała

Callegari

et al. 2022

Contrib Mineral Petrol

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“…Different origins of garnet may occur on the same grain, with different metamorphic dehydration or partial melting conditions being recorded. Therefore, garnet plays an important role in revealing the evolution of subduction zone processes, including pressure and temperature conditions (Hickmott and Spear, 1992;Xia et al, 2016;Xia and Zhou, 2017;Deng et al, 2022;He et al, 2022), along with the duration of the metasomatism, deformation and anatexis (e.g., Storey and Prior, 2005;Caddick et al, 2010;Pollington and Baxter, 2010;Caddick and Kohn, 2013;Angiboust et al, 2014).…”

Section: Origin Of the Garnetmentioning

confidence: 99%

“…4d, e), which should be the primary melt inclusions trapped during the growth of peritectic garnet as the partial melting progressed. These features are considered to be diagnostic of peritectic garnet in the presence of hydrous melts (Perchuk et al, 2005(Perchuk et al, , 2008Xia et al, 2016;He et al, 2022). But, from the perspective of metamorphic evolution, it is more reasonable to classify Grt1c as having a metamorphic origin during the peak stage when the partial melting had just begun (He et al, 2022).…”

Section: Origin Of the Garnetmentioning

confidence: 99%

Trace Elements of Multi‐stage Minerals and Titanite U‐Pb Dating for the Gneisses from Liansan Island, Sulu UHPM Belt

SONG,

CAO,

XIE

et al. 2023

Acta Geologica Sinica (Eng)

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Gneisses with anatectic characteristics from the Liansan Island in Sulu UHPM belt were studied for petrography, titanite U‐Pb dating and mineral geochemistry. Three origins of garnets are distinguished: metamorphic garnet, peritectic garnet and anatectic garnet, which are formed in the stages of the peak metamorphism, retrograded anatexis and melt crystallization, respectively. The euhedral titanite has high content of REE and high Th/U ratios, which is interpreted to be newly formed from an anatectic melt. The LA‐ICP‐MS titanite U‐Pb dating yields 214∼217 Ma ages for the titanite (melt) crystallization. The distribution of trace elements varies in response to the different host minerals at different stages. At the peak metamorphic stage, Y and HREE are mainly hosted by garnet, Ba and Rb are by phengite, Sr, Nb, Ta, Pb, Th, U and LREE are by allanite, and Y, U and HREE are by zircon. During the partial melting, Y, Pb, Th, U and REE are released into melt, which caused dramatic decline of these element content in the retrograded minerals. At last, titanite absorbs mostly of Nb, U, LREE and HREE from the melt. Therefore, different stages of metamorphism have different mineral assemblages which host different trace elements.

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“…Under the metamorphic environment, we can utilize the contents and variations of Ca, Mn, Fe, and Mg in garnet to evaluate the pressure (P)-temperature (T) condition (Andrew, 1994;Gerya et al, 1997). The principle is that the P-T condition has an impact on cooperation of these cations into crystal structures of garnet in relation with anions' charge and radius (Shannon, 1976;Smith et al, 2004;Xia et al, 2016). For the same (II) charge substituting to the "A" location, the decreasing order of anions radius Ca 2+ > Mn 2+ > Fe 2+ > Mg 2+ is sensitive to reflect the fluctuation of the P-T condition (Zhou et al, 2014), that is, Ca-rich garnet formed in low-pressured contact metamorphism, Mn-Al-rich garnet formed in low-grade regional metamorphism, Fe-Al-rich garnet formed in relatively higher regional metamorphism, and Mg-rich garnet formed in high-pressured metamorphism (Yardley et al, 1991;Jamtveit et al, 1993;Crowe et al, 2001;Fernando et al, 2003).…”

Section: Physicochemical Condition Recorded By Garnetmentioning

confidence: 99%

Gem-Grade Garnet With Metamorphic Origin in the Tiemurt Orogenic-Type Deposit, Chinese Altay Orogen: Texture, Chemistry, and Physicochemical Condition

Zheng

et al. 2021

Front. Earth Sci.

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The Chinese Altay Orogen represents an accretionary collage with episodic subduction-related accretion from the Neoproterozoic to Permian, followed by Triassic continent–continent collision. Reddish gem-grade garnet grains are widespread in Au–Cu–Pb–Zn sulfide deposits of the Chinese Altay Orogen, and how their formation links to regional geological processes such as seafloor sedimentation, magmatic hydrothermal metasomatic, or orogenic metamorphism remains unclear. In this context, we present an integrated set of geological occurrences, mineral texture, and major trace elemental geochemistry of six garnet grains from the representative Tiemurt Cu–Pb–Zn(-Au) deposit. Two categories of garnets, Grt1 and Grt2, are identified in terms of distinct mineral assemblages, textures, and geochemistry. The sub- to euhedral biotite inclusion–rich Grt1 with fine grains of less than 0.3 cm in diameter is intergrown with amphibole, chlorite, and biotite. Comparatively, the euhedral mineral inclusion–poor Grt2 with coarse grains of 0.5–5 cm in diameter is paragenetic with quartz, calcite, chlorite, and biotite. Forty-one EMPA analyses show that Grt1 and Grt2 have similar major elemental compositions of SiO2 (36.2–37.5 wt%), Al2O3 (19.9–20.7 wt%), and CaO (5.3–7.8 wt%) but host variable contents of FeO (31.7–35.9 wt% for Grt1 and 23.0–30.0 wt% for Grt2) and MnO (0.8–3.7 wt% for Grt1 and 4.3–12.7 wt% for Grt2). Both Grt1 (with a chemical formula of Alm49.3–54.6Spe19.7–24.6Gro14.6–18.4Pyr3.7–4.8And3.5–4.9) and Grt2 (Alm57.4–64.4Gro15.5–18.3Spe9.62–19.8Pyr3.8–5.7And1.1–4.4) are plotted into the field close to the end-member of almandine (Fe-Al–garnet). Compared to Grt1, Grt2 displays a Fe-enriched and Mn-depleted trend. Additionally, Mn is enriched in the core but Fe is enriched in the rim on the major elemental profile of Grt1. Regarding the trends of trace elements and REEs, Grt2 is believed to be produced during the detriment and replacement of Grt1 by an intense external metal-rich fluid. In combination with previous fluid inclusion research, the garnet-related fluids are characterized by CO2-rich, mesothermal, mildly acidic, and reduced redox, analogous to metamorphic fluids generated during orogenesis. Collectively, we conclude that the reddish gem-grade garnet crystals in the Chinese Altay Orogen are of metamorphic origin.

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Growth of metamorphic and peritectic garnets in ultrahigh-pressure metagranite during continental subduction and exhumation in the Dabie orogen

Cited by 30 publications

References 145 publications

Zircon and monazite reveal late Cambrian/early Ordovician partial melting of the Central Seve Nappe Complex, Scandinavian Caledonides

Zircon and monazite reveal late Cambrian/early Ordovician partial melting of the Central Seve Nappe Complex, Scandinavian Caledonides

Trace Elements of Multi‐stage Minerals and Titanite U‐Pb Dating for the Gneisses from Liansan Island, Sulu UHPM Belt

Gem-Grade Garnet With Metamorphic Origin in the Tiemurt Orogenic-Type Deposit, Chinese Altay Orogen: Texture, Chemistry, and Physicochemical Condition

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